chore(deps) bump penlight from 1.8.0 to 1.9.0

  - `compat.wrap` a `coroutine.wrap` implementation that works like plain Lua
    on OpenResty. (#342)

  - In `pl.class`, `_init` can now be inherited from grandparent (or older ancestor) classes. [#289](lunarmodules/Penlight#289)
  - Using `compat.wrap` it now fixes `dir.dirtree`, `pl.lexer` on OpenResty. [#342](lunarmodules/Penlight#342)

kong-2.1.4-0.rockspec

@@ -14,7 +14,7 @@ dependencies = {
   "inspect == 3.1.1",
   "luasec == 0.9",
   "luasocket == 3.0-rc1",
-  "penlight == 1.8.0",
+  "penlight == 1.9.0",
   "lua-resty-http == 0.15",
   "lua-resty-jit-uuid == 0.0.7",
   "lua-ffi-zlib == 0.5",